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1, 3, 6, 13, 31, 72, 169, 398, 935, 2197, 5166, 12147, 28561, 67157, 157908, 371293, 873035, 2052796, 4826809, 11349444, 26686341, 62748517, 147542765, 346922421, 815730721, 1918055941, 4509991466
(list; graph; refs; listen; history; internal format)
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